auto save

diy2.py

+username = "python"
+userpassword = "123456"
+i=3
+while True:
+    if i>0
+        name = input("请输入用户名:\n")
+        password = input("请输入密码:\n")
+        
+        if name == username and password == userpassword:
+            print("登录成功!")
+            i-=1
+            break
+        if name!=username:
+            print("用户名错误!")
+            i-=1
+            continue
+        if password!=userpassword:
+            print("密码错误")
+            i-=1   
+    else;
+        print("你的账号已被锁定，请到我司解锁")
+    exit()
+    print("欢迎来到贝尔编程")
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